Summary

“Jesus Christ, save him, Justin is shirtless far too often for Zack’s little bisexual heart to handle. It doesn’t help that he’s his best friend, and hilarious, and kind, and so bright, and he makes Zack smile so damn much and it really, really isn’t fair, at all. Not even remotely fair.

So Zack does what any horny, crushing, not-straight, sex-starved, self-proclaimed masturbation expert would do, and he fingers himself.”

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Or: The Zustin smut fic absolutely no one asked for, but I chose to write anyways.